First Time (1970)

The film opens on Sylvia having just completed the murder of her boyfriend. However as she stands there, staring at his body, she panics. After washing the blood off her hands, she starts to drag the body into her back garden. As she collects her spade she looks at the body and realizes to her horror, that it is still breathing. Looking at him, she calms herself and finishes him off with a cold smack of her spade. Smiling, finally at peace with her decision, she begins to bury the body.